Isokinetic testing of ankle strength in older adults: Assessment of inter-rater reliability and stability of strength over six months

Rebecca Morris-Chatta, David M. Buchner, Barbara J. de Lateur, M. Elaine Cress, Edward H. Wagner

Research output: Contribution to journalArticle

Abstract

The study purposes were (1) to estimate the inter-rater reliability of isokinetic strength tests at the ankle in older adults (test-retest interval of three to 7 days), and to determine whether more experienced examiners were more reliable; and (2) to estimate 6 month stability of strength tests. Inter-rater reliability was high for plantar flexion and dorsiflexion tests where average strength was more than about 10 Newton-meters (Nm) (Pearson R = 0.87-0.95). When average strength was less than 10Nm, reliability was less (R = 0.42-0.75). Experienced examiners (physical therapists) and less experienced examiners (research assistants) were equally reliable. Variability in strength over 6 months was no greater than variability over a few days. We conclude that isokinetic tests of ankle strength in older adults are highly reliable and stable when examiners are adequately trained and subjects maintain usual physical activity levels.

Original languageEnglish (US)
Pages (from-to)1213-1216
Number of pages4
JournalArchives of physical medicine and rehabilitation
Volume75
Issue number11
DOIs
StatePublished - Nov 1994
Externally publishedYes

ASJC Scopus subject areas

  • Physical Therapy, Sports Therapy and Rehabilitation
  • Rehabilitation

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